Patent FR-2924709-A1 (FR)
Title: Device for the purification of domestic wastewater, comprises a filtering medium through which the wastewater is intended to flow, and two filtering containers stacked with one another, where the medium comprises rubber aggregate layers
Inventor: GANDEMER JACQUES
IPC: B01D24/12
Filed: 2007-12-11
Abstract: The device for the purification of domestic wastewater, comprises a filtering medium through which the wastewater is intended to flow, and two filtering containers (2) stacked with one another. The filtering medium comprises a first layer (10) of rubber aggregates of which 80 mass% have a particle size of 1.5 mm, a second layer of rubber aggregates of which 80 mass% have a particle size of less than 1.5 mm, and a sand filtration layer having a minimum thickness of 100 mm. The first and second layers of the rubber aggregates have a thickness of 300 mm and 100-300 mm respectively. The device for the purification of domestic wastewater, comprises a filtering medium through which the wastewater is intended to flow, and two filtering containers (2) stacked with one another. The filtering medium comprises a first layer (10) of rubber aggregates of which 80 mass% have a particle size of 1.5 mm, a second layer of rubber aggregates of which 80 mass% have a particle size of less than 1.5 mm, and a sand filtration layer having a minimum thickness of 100 mm. The first and second layers of the rubber aggregates have a thickness of 300 mm and 100-300 mm respectively. The filtering medium is conditioned in the internal volume of the containers. The container comprises peripheral walls (4), a top wall (5) and a bottom wall (6). The top wall and the bottom wall are fitted with holes for introducing and exiting the water to be treated respectively. The internal volume of the container comprises the rubber granulate layers separated by an interlayer wall equipped with openings allowing the passage of water to be treated from the first layer to the second layer in the direction of wastewater flow. The wastewater is arranged to successively pass in each of the containers by gravity. The filtering containers comprise an upper peripheral edge bordering the top wall and projecting with respect to the wall, a lower support structure to constitute the unit for stabilizing the stacked containers, and a drainage system for the recovery of purified water. The filtering containers are fitted with a system (3) ensuring the homogeneous discharge of wastewater on the upper surface of the rubber aggregate layer, a distribution system composed of a central pipe supplied from each side of which an intermediate transport pipe extends, pipes equipped with holes that are regularly distributed between feed channels and channels with discharge openings regularly distributed throughout the top wall. The central supply pipe extends over the length or width of the container. The ends of the supply pipe are equipped with a complementary locking unit for placing central pipes in series arrangement and the containers in opposite direction. The drainage system comprises a lower tray within which a perforated evacuation pipe extends over the length or width of the container. The rubber aggregates are obtained by recycling the used tires.